Answer Happy

Based on your own independent research, you are required to design a refrigerator that operates according to the reverse Brayton cycle, which is capable of removing heat from a liquid at -50 °C at a rate of 20 kW, and rejecting it to the external atmosphere, which has a temperature of 30 °C. Your design should: Feature the following components: one compressor, one low temperature heat exchanger, one high temperature heat exchanger and one turbine Employ a gas which is suitable for use as a working fluid Operate as efficiently as possible Account for obvious non-ideal effects which would realistically reduce its efficiency The design calculations you perform should enable the evaluation of the following key parameters: The pressure and temperature of the working fluid at the inlet of each component The change in the specific entropy of the working fluid across each component The mass flow rate of the working fluid The power developed by the turbine The pressure ratio of the compressor The rate at which heat is rejected by the refrigerator The refrigerator's coefficient of performance